Chain grate.



P. L. ROWE A. FRANKENHEIM.

- CHAIN GRATE.

APPLICATION FILED MAR.9,1914.

Patented N0v.3,1914.

4mm/ver UNITED sTATEs PATENT oEEicE.

PAUL L. cEowE AND AARON or NEW Yoan, N. Y.

CHAIN sans;

Specication of Letters Patent. Patented NOV. 3, 1914.

Application led March 9, 1914. Serial No. :$23,388.

being to. provide a construction which is simple, strong, effective and easy to put together and take apart.

i matter of fact the In the accompanying drawings illustrating the invention: Figure 1 is an elevation of a grate-bar, its intermediate portion being shown broken away for economy o f space, and the chains at the ends being indicated in section; Fig. 2 is a side elevation of a portion of the upper course of the. grate, one of the grate-bars and the horizontal links being shown in vertical section; Fig. 3 is a plan view of the same; and- Fig. i is a detail view on an enlarged scale, showing a modification.

It will be understood that these chai grates 'are endless structures passing around suitable sprockets at front and back, andbeing driven slowly or intermittently to feed a continuous layer of fuel into and through the combustion chamber of the furnace. In the present instance the grate is composed of transverse grate-bars 1 and endless chains 2 at the ends of the bars.vv These chains are of the cable chain variety.V and are disposed with their links alternately horizontal and vertical, assuming the chain to--be running horizontally, though as a grate may be disposedat an inclination.

The terms horizontal-57 and vertical links are used herein for convenience, to

designate links which are parallel and perpendicular, respectively, to the plane of the rate. g Each grate-bar comprises a longitudinal web portion .3 and a vlaterally-projecting fuel-bearing portion 4,'- of suitable formation. As shown, these fuel-bearing portions are continuousfand provided witlidraft openings, a few of whichare indicated; but other constructions will do as well. In the v link 2a of one of the chains.

present instance the term web portion is used generally to designate the narrower structural part of the bar which projects vdownward from the Ifuel-bearing portion.

The exact shape of the grate-bar is not essential.

At one end of the bar, the web 3 is cut away or omitted for a short distance, as at 5, to form a recess to accommodate a vertical To this vertical link the end of the bar is attached by a pin 6 :projecting horizontally from the end of the web beneath the overhang of the endwise projecting upper portion of the bar. This pin is preferably a separate piece of metal from the grate-bar, being united therewith by the fact of the metal of the bar being cast around the inner portion of the pin ,in the process of manufacture. This pin is headless at its outer end and is readily inserted endwise into the opening of the vertical link. At the other end the web is recessed at the bottom, as shown at 7, so that the depth of the web is reduced from the point 8 to the end of the bar. A vertical socket 9 is formed in this reduced portion of the web, for the reception of av removable and replaceable vertical attaching pin 10, the lower end of which is provided with a head 11. In attaching the n grate-bar to the chains thel said pin is passed upward through the openin in a horizontal link 2b and between the en s of the two adi-ifYA j i 'jacent vertical links 2*, fitting this opening,

verse registering openings in the attaching pin and the web of the bar, beneath the fuelsupporting portion 4. The `head 11 comes beneath the horizontal link, and being too large to pass therethrough reliably secures this end of the bar to the chain. v It is to be noted that the head of the pin10 merges `into the shank on a curvature, lso that, at

front and back, downwardly and outwardly curved surfaces 13 arevprovided for the reception of the rounded ends of the vertical links 2a, which are thus enabled to work on the Apin in turning around the sprockets (notshown) without necessitating looseness in the connection. The retaining pin 12 performs its function reliably, and -is of especial advantage in that the ease of its refl moval is not seriously affected by rusting or the action of heat on the metal parts.

Fig. 4: illustrates a modified construction in which the shank of the attaching pin 10a is curved, and passes movably through` a curved socket 9a, its upper end being transversely apertured at 15 for the reception of a cotter pin.

In the grate as assembled, the bars are arranged alongside of each other with their vertical and horizontal pin ends alternating. That is to say, if in any one gratebar the vertical pin 10 is at the left end and the horizontal pin 6 at the right, in the two bars at opposite sides of it these conditions will be just reversed. Adjacent ends of adjacent bars engage adjacent links of the corresponding cable chain. Thus, at one side of the grate, the end of one bar engages a horizontal link, the end of the next bar engages the next, vertical link, and so on in alternation; and it follows that the vertical links of one chain are directly opposite the horizontal links of' the other chain. By virtue of these relations the bars are held securely to the chains with only a single headed removable fastener apiece, because with the grate once assembled the. amount of relative movement, laterally of the grate as a whole, which can take place between the bars and chains is too slight to permit the plain pins 6 to escape from the vertical links.

The subject-matter of this case was in substance disclosed in our prior application Serial No. 400,722, iiled November 4, 1007, but is' not therein claimed, such claims beingreserved for this application with benefit of the iiling date of the earlier case.

What we claim as new is:

l. In a chain grate, the combination with a cable chain comprising horizontal and vertical links, of a transverse grate-bar comprising a longitudinal web portion and a vlaterally-projecting fuel-bearing portion, said grate-bar having a .vertical socket in one end of its web portion, a removable vertical attaching pin inserted upward into said socket through a horizontal link of said chain and having a head on its lower end beneath said link, and a retaining pin passed through the upper portion of said attaching pin and holding the same in said socket.

. 2. In a chain grate, the combination with a cable chain comprising horizontal and vertical links, of a transverse grate-bar comprising a longitudinal web portion 'and a late1.'ally-projecting fuel-bearing portion, said web portion being recessed at the bottom so as to be reduced in depth from a point adjacent one end of the bar to the end thereof and having a vertical socket in said recessed region, a removable vertical attaching pin inserted upward into said socket through a horizontal link of said chain and having a head on its lower end beneath said link, said web portion and attaching pin having registering transverse openings, and a retaining pin passed through said openings beneath said fuelbearing portion.

3. In a chain grate, the combination with two cable chains having their alternate links arranged substantially horizontally and vertically, the horizontal links on one side being. opposite the vertical links on the other side and vice-versa, of a series of grate-bars, each having at one end a vertical socket and a removable vertical headed attaching pin therein and at the other end a permanent horizontally-projecting plain pin, said headed pin passing through a horizontal link of one chain with its head be.

witnesses.

IAUL L. CROWE. AARON FRANKENHEIM. IVitnesses:

' J. F. BRANDENBURG,

E. GREENBERGER. 

